It is your husband’s duty to take care of you and to ensure that your necessities are provided for you. If he is doing this, then he is fulfilling his shar’I responsibility towards you. The manner in which he manages his finances should not concern you.
However, if he does not see to your necessities, and as a result you have to ask for money from your mother-in-law, then your husband is failing in his duty as a husband. Ideally, he should stipulate a monthly allowance for you.
Darul Iftaa
Madrasah In’aamiyyah
Camperdown
South Africa